Technical Information Fig. 116 'MF' Series

Specifications:

Flanges:	As 2129 Tables E & F
Working Pressure:	Table E 1400 kPa Table F 2100 kPa
Adjustable Ranges:	0-115, 70-230, 200-700, 600-1100, 700-1500 kPa
Temperature Range:	Water 5 - 60°C

The Type ‘MF’ Reducing Valve is hydraulically operated, single seated, piston actuated, diaphragm pilot controlled and spring regulated.

Automatically reduces higher and fluctuating inlet pressure to constant outlet pressures regardless of the flow demands.

The diaphragm pilot control closes when outlet setting is attained, diverting inlet pressure to the piston which closes the main valve at the rate determined by the flow restrictor. The "V-Ported" valve guide eliminates closing ‘slam.’ Under operating conditions the main valve establishes a throttling position as determined by the pilot control.

Dimensions:

Valve Size	80	100	150	200	250	300	400	450	500	610	750
‘A’	295	355	445	610	760	915	1220	1370	1525	1675	2030
‘B’	95	140	165	205	230	330	400	430	500	510	610
‘C’	360	510	560	690	720	760	1000	900	850	1020	1140
‘D’	150	165	200	300	300	400	500	560	600	660	770
‘E’	150	150	200	300	300	300	360	400	450	490	620
Mass/kg	42	65	120	250	450	700	1350	1700	2100	2700	5000

Materials:

Body and Cover:	Cast Iron AS 1830/T250
Valve Carrier:	150-300mm Bronze AS 1565/836B 400-750mm Cast Iron AS 1830/T250
Internal Parts:	Bronze AS 1565/836B Grade 316 Stainless Steel
Valve Disc and Seals:	Polyurethane Neoprene
Pilot Valve:	Bronze AS 1565/836B Grade 316 Stainless Steel
Coatings:	Epoxy Paint Int. & Ext. (0.5mm min. D.F.T.)

Flows (I/sec):

Valve Size	100	150	200	250	300	400	450	500	610	750
Recommended Min.	2	4	10	15	22	39	48	60	86	136
Normal Max. P/line Vel. 6m/sec.	40	80	190	300	430	770	970	1190	1720	2730
Occasional Max. P/line Vel. 8m/sec.	55	110	250	400	570	1020	1300	1590	2290	3640

The life of any valve will be shortened by high velocity flows.

Cavitation may occur if the intersection point of inlet and outlet pressures fall within the shaded zone.

The siting of a reducing valve to obtain a higher outlet pressure reduces the risk of cavitation and the need for special trim materials.

When minimum flows are anticipated we recommend that a direct-acting reducing valve be installed in parallel to handle the smaller flows.